[SCSI] zfcp: fix return code of zfcp_scsi_slave_alloc

Change return code in slave_alloc to avoid irritating error message from
scsi_alloc_sdev() when scsi stack tries target scan.
Signed-off-by: NAndreas Herrmann <aherrman@de.ibm.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/s390/scsi/zfcp_scsi.c

@@ -179,7 +179,7 @@ zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 	struct zfcp_adapter *adapter;
 	struct zfcp_unit *unit;
 	unsigned long flags;
-	int retval = -ENODEV;
+	int retval = -ENXIO;
 
 	adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 	if (!adapter)